Yes David,to me these Heads look like they would love to have the flame light off way more in the middle of the chamber, no?
A colder plug , and yes the grinding off of the excess unused threads would need to take place as posted also.

LOL Bill, I didn't say I was going to do it. But, if I was going to do it, I'd just lathe up some "adaptors". My post was just to show there looks to be an alternative for guys without access to a lathe.

Heat is energy, energy is horsepower...but you gotta control the heat.
-Carl

Bill-C You can Call REAM Richardson Engineering and products, They make adapters but for a tapered plug And they will make the same adapters as Garrett Machine used to, alot of people on the Bigblock Forums used to use them. Talk to John and said around 10 bucks. These are for 3/4 reach but i'm sure he can make for 5/8 or what ever you wanted cheap. Made of same material as a plug. 1-9892770141

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